Experiments are underway in Poland in an attempt to boost coal gasification, a process which converts coal into gas.

Coal is one of the most polluting fossil fuels, and Poland is one of Europe's worst coal polluters. Gasification results in the extraction of the much cleaner gas, methane, to the surface.

The process will take place in a mine 400 metres below ground, where a special reactor is being built. A mixture of gas, air, oxygen and steam will be pumped into the reactor to turn more than a thousand tonnes of coal into gas, at a temperature of 1,200 degrees Celsius.